Bosch Security Systems Inc. M521 Manual Do Utilizador
TELEX PST-170 Transmitter, Continued
Page 3
Audio Input: There are 2 audio input jacks on the transmitter. One is the normally used microphone input.
This input is located on the transmitter top panel “step”. A microphone is supplied with the transmitter but
other types can be used as well. Place the microphone element about 8 to 10 inches below the mouth of the
user. Adjust the gain mentioned above to adjust the transmitted volume. Excessive input levels may sound
unnatural and the Treble Clef symbol will come on, indicating “overload”. Adjust the microphone volume
before using the Aux input.
This input is located on the transmitter top panel “step”. A microphone is supplied with the transmitter but
other types can be used as well. Place the microphone element about 8 to 10 inches below the mouth of the
user. Adjust the gain mentioned above to adjust the transmitted volume. Excessive input levels may sound
unnatural and the Treble Clef symbol will come on, indicating “overload”. Adjust the microphone volume
before using the Aux input.
The second audio input, the Auxilliary input jack is located on the side of the transmitter case. The input jack
is a 1/8 inch stereo/mono jack designed to allow audio devices such as teachers aids or tape recorders to be
used. Typical input level is 100 mV RMS maximum for normal modulation. Input exceeding this level will
cause the audio to “limit” which may also sound unnatural. Input “overload” will be indicated by the Treble
Clef Symbol coming on (flashing). Reduce the input level in if this should happen, with the input device’s
is a 1/8 inch stereo/mono jack designed to allow audio devices such as teachers aids or tape recorders to be
used. Typical input level is 100 mV RMS maximum for normal modulation. Input exceeding this level will
cause the audio to “limit” which may also sound unnatural. Input “overload” will be indicated by the Treble
Clef Symbol coming on (flashing). Reduce the input level in if this should happen, with the input device’s
control . Turn the program material on (tape recorder, PA, etc. or use the microphone) Adjust the appropriate
tape output etc. level control until loud program material passages sound natural in the receiver. This allows
sufficient “headroom” to prevent peak distortion on loud inputs.
tape output etc. level control until loud program material passages sound natural in the receiver. This allows
sufficient “headroom” to prevent peak distortion on loud inputs.
System Walk Through: Now that the transmitter is set up, you should be able to hear the program material on the
appropriate receiver. Walk the receiver through the area that it is intended to be used in. Check for any noise or
interference that would cause undesired operation. Some of the causes of poor performance are listed below.
Poor transmitter location.
Poor receiver location.
Interference.
interference that would cause undesired operation. Some of the causes of poor performance are listed below.
Poor transmitter location.
Poor receiver location.
Interference.
Local AC Line noise.
RF “Trouble Spots”
Operating distance beyond system capability
Additional Information:
Transmitter/Receiver Channel Selection:
As mentioned in the Set-Up instructions, be sure to check the receiver channels first to insure that no interference
is present. If more than one system is to be used at the same location, check the channels as each transmitter is
added to insure that interference between units is not being generated. Two transmitters can sometimes be
operated on the same channel if they are widely separated (over 300 feet apart). For best multiple system
performance (all units in the same area) do not assign adjacent channels to each unit. Up to four systems can be
used in the same area without co-system interference. Some experiments with channel selection may be
necessary to suit local conditions. All frequencies used by the PST-170 transmitter may be shared by other
legitimate users.
is present. If more than one system is to be used at the same location, check the channels as each transmitter is
added to insure that interference between units is not being generated. Two transmitters can sometimes be
operated on the same channel if they are widely separated (over 300 feet apart). For best multiple system
performance (all units in the same area) do not assign adjacent channels to each unit. Up to four systems can be
used in the same area without co-system interference. Some experiments with channel selection may be
necessary to suit local conditions. All frequencies used by the PST-170 transmitter may be shared by other
legitimate users.